Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ion-exchange polymer or process of preparing
Patent
1993-06-21
1994-12-06
Zitomer, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Ion-exchange polymer or process of preparing
521 25, 521 27, 521 31, 525154, 5253302, 525383, B01J 3918, C08F 828, C08J 522, C08L 2326
Patent
active
053711106
ABSTRACT:
An ion exchange polymer comprised of an alkali metal or alkaline earth metal salt of a poly(carboxylic acid) in a poly(vinyl acetal) matrix is described. The polymer is made by treating a mixture made of poly(vinyl alcohol) and poly(acrylic acid) with a suitable aldehyde and an acid catalyst to cause acetalization with some cross-linking. The material is then subjected to an alkaline aqueous solution of an alkali metal salt or an alkali earth metal salt. All of the film forming and cross-linking steps can be carried out simultaneously, if desired.
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Philipp et al, Kinetics of Copper Ion Absorption by Cross-Linked Calcium Polyacrylate Membranes Feb. 1983, p. 2, NASA Technical Memorandum 83052.
Philipp et al, Ion Exchange Selectivity for Cross-Linked Polyacrylic Acid, Sep. 1983, NASA Technical Memorandum 83427.
Philipp Warren H.
Street, Jr. Kenneth W.
Mackin James A.
Miller Guy M.
Shook Gene E.
The United States of America as represented by the Administrator
Zitomer Fred
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